Jeremy, if I were you I'd go to the matresses.
You aren't going to win this by wallpaper. Gonna take a new tail. And stop sanding the rest of that part because it's probably a problem all over.
If you can, take an impression in plaster of paris of whats left of that section of the tail and cast a new one. This can be done with epoxy.Or, more plaster of paris but I'm guessing it's a thin part.
"Heh, come over here, kid, learn something. You never know, you might have to cook for 20 guys someday. You see, you start out with a little bit of oil. Then you fry some garlic. Then you throw in some tomatoes, tomato paste, you fry it; ya make sure it doesn't stick. You get it to a boil; you shove in all your sausage and your meatballs; heh…? And a little bit o' wine. An' a little bit o' sugar, and that's my trick."